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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9a31e931248717cda4d777d76abfc6c58c9ad787b3b33f94a06386dffcf5a4' 
  AND token = 'czGDbm76u+EFHFFHLSAbRMDq2O+RKS8k+l9/gGP9shs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}